Fix compile for ESA/390 mainframe
Fix compile for ESA/390 mainframe

cwilling/oiio,YangYangTL/oiio,micler/oiio,OpenImageIO/oiio,scott-wilson/oiio,micler/oiio,cwilling/oiio,lgritz/oiio,micler/oiio,cwilling/oiio,sambler/oiio,micler/oiio,bdeluca/oiio,mcanthony/oiio,mcanthony/oiio,mcanthony/oiio,lgritz/oiio,mcanthony/oiio,scott-wilson/oiio,OpenImageIO/oiio,OpenImageIO/oiio,YangYangTL/oiio,bdeluca/oiio,sambler/oiio,bdeluca/oiio,OpenImageIO/oiio,bdeluca/oiio,YangYangTL/oiio,scott-wilson/oiio,cwilling/oiio,sambler/oiio,sambler/oiio,lgritz/oiio,lgritz/oiio,YangYangTL/oiio,scott-wilson/oiio